Aircraft Engineering’s Function concerns avionic and aircraft system, Maintenance Program preparation; aircraft repair instruction, airworthiness directives assessment and accomplishment, aircraft inspection and modification assessment; and reliability of aircraft and component including aircraft configuration control, aircraft damage investigation and technical support by providing technical instruction and its clarification to personnel of Line Maintenance. In some circumstances aircraft engineer may assist negotiate aircraft lease agreement and to review new aircraft specification. Furthermore aircraft engineering office will liaison with service providers and manufacturers in technical matter and service specification.